Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Two QJ's into one

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Shark Racer:
FWIW, the only way to really set your advance curve is with some kind of performance metric. If it's pinging you've certainly gone too far, but you can go too far without pinging as well.

Bending the pump arm is one way to change shot, you could also move it to the outside setting and shorten the pump shaft I believe. Cliff knows the answer to that one and I believe you can find info on the forum via search (don't want to be that guy, I just know I've seen it on here before)

Cliff Ruggles:
We have longer pumps, and also a .100 longer pump arm to reduce pump shot.  Either way accomplishes the same thing.

The easiest way to pull the nozzles is to insert a punch that just fits them, and apply outward pressure 360 degrees.  Do a couple of circles and they will fall right out........Cliff

F250 Restorer:
It is rare a customer finds a business like Cliff's.  He has helped me by answering untold posts, always offering the best advise and guidance. 

By following his advice about v.advance being a major player in mpg, I solved another issue and increased my mpg. 

I have to admit that the QJ intimidated me when I first started working on it.  But now I've grown very found of it for performance and mpg. 

Cliff Ruggles:
They do work flawlessly and as good as any fuel injection set-up, once you get them dialed in exactly for the application.  With the in line 6, it's not a common set-up, so may take longer to nail down the tune, but the end result will be a nice running engine, and great fuel economy.

I've been up in the mid-20 MPG range with several cars I've owned that were Q-jet equipped.  Nailed down 29mpgs on my 84 Impala, and 25mpgs on the 67 Impala SS that I used to own.  Not to mention dead solid reliability the entire time I owned them......Cliff

F250 Restorer:
Cliff--

I was adjusting the point where the v.advance comes in, in an effort to add some more mpg.  I changed it from 900 rpm to about 1600 rpm.  Is that moving it in the correct direction? 

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